Choosing keywords to search can be difficult. Selecting the wrong keyword may result in being overwhelmed or disappointed with the amount of information that you retrieve. That's why it's important to know how to use tools such as Boolean Operators. Boolean operators are used to connect search terms in ways that narrow or broaden a search. There are three commonly used Boolean operators: AND, OR, and NOT.
AND narrows the search to include all the words.
OR broaden the search to include any of the words.
The NOT operator excludes a term or group of terms from your search.